The preparation of IELTS speaking topic is the most important part in IELTS speaking test. However, the topic is not fixed and it's necessary to learn the rules of these changes.

雅思口语话题(topic)的准备是大家在备考雅思口语考试的时候最重要的部分，但是大家要了解雅思口语话题并不是一成不变的，了解了这个变化的规律，有助于大家选择考试的时间，提高考试成绩。

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These methods for fixed quality and quantity were simple, reliable for quality control of preparation.

所建立的定性、定量方法简便，结果可靠，能有效地控制该产品质量。

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Conclusion: the use of knitted retraction cord during fixed prosthodontic treatment obviously improves the preparation of cervical margins of teeth with a high degree of precision and adaptation.

结论：固定修复中使用排龈线可以明显提高颈缘制备的精度和密合度，具有良好的临床效果。

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